학술논문
Search for sub-GeV dark matter by annual modulation using XMASS-I detector
Document Type
article
Author
M. Kobayashi; K. Abe; K. Hiraide; K. Ichimura; Y. Kishimoto; K. Kobayashi; S. Moriyama; M. Nakahata; H. Ogawa; K. Sato; H. Sekiya; T. Suzuki; A. Takeda; S. Tasaka; M. Yamashita; B.S. Yang; N.Y. Kim; Y.D. Kim; Y. Itow; K. Kanzawa; K. Masuda; K. Martens; Y. Suzuki; B.D. Xu; K. Miuchi; N. Oka; Y. Takeuchi; Y.H. Kim; K.B. Lee; M.K. Lee; Y. Fukuda; M. Miyasaka; K. Nishijima; K. Fushimi; G. Kanzaki; S. Nakamura
Source
Physics Letters B, Vol 795, Iss , Pp 308-313 (2019)
Subject
Language
English
ISSN
0370-2693
Abstract
A search for dark matter (DM) with mass in the sub-GeV region (0.32–1 GeV) was conducted by looking for an annual modulation signal in XMASS, a single-phase liquid xenon detector. Inelastic nuclear scattering accompanied by bremsstrahlung emission was used to search down to an electron equivalent energy of 1 keV. The data used had a live time of 2.8 years (3.5 years in calendar time), resulting in a total exposure of 2.38 ton-years. No significant modulation signal was observed and 90% confidence level upper limits of 1.6×10−33 cm2 at 0.5 GeV was set for the DM-nucleon cross section. This is the first experimental result of a search for DM mediated by the bremsstrahlung effect. In addition, a search for DM with mass in the multi-GeV region (4–20 GeV) was conducted with a lower energy threshold than previous analysis of XMASS. Elastic nuclear scattering was used to search down to a nuclear recoil equivalent energy of 2.3 keV, and upper limits of 2.9 ×10−42 cm2 at 8 GeV was obtained. Keywords: Sub-GeV dark matter, Annual modulation, Liquid xenon